OK I found out that the plugs I bought were HR9DPX Bosch Platinum. But what I do not understand is why these plugs were listed in the car parts catalogue as the appropriate plugs for this car. Also when I originally bought the NGK plugs, from NAPA parts, they looked it up in their system and sold me these plugs. So are the major retailers are not aware of this resistance problem????

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190e 2.6 1990. 300,000 KM
C230 K 2000, 130,000 KM